10 Signs You Need an Endoscopy — Don't Ignore These Symptoms

Your digestive system sends signals when something is wrong. Most GI symptoms resolve on their own — but some are the body's way of flagging a problem that needs to be seen. An endoscopy is the direct, most reliable way to look inside the esophagus, stomach, and colon and find what's actually going on.

Here are 10 symptoms that mean you should stop self-treating and book an appointment.

1. Heartburn or Acid Reflux That Doesn't Improve With Antacids

Occasional heartburn after a heavy meal is normal. But if you're reaching for antacids more than twice a week, or if your heartburn wakes you at night, something more significant may be happening.

Persistent GERD (gastro-oesophageal reflux disease) can damage the lining of the esophagus and lead to Barrett's esophagus — a pre-cancerous condition. An upper GI endoscopy (OGD) is the only way to check whether the esophageal lining has been damaged and whether Barrett's changes are present.

2. Difficulty Swallowing (Dysphagia)

Dysphagia — the sensation that food is sticking or getting stuck — is a red-flag symptom that requires prompt investigation. It can indicate:

• Esophageal stricture (narrowing due to scarring or GERD)
• Esophageal cancer
• Achalasia (failure of the lower esophageal muscle to relax)
• Esophageal web or ring

An OGD will visualise the esophagus and identify the cause. In many cases, a stricture can be dilated during the same procedure.

3. Blood in Stool or Vomit

This is perhaps the most urgent sign on this list. Blood in your stool can appear in two ways:

• Bright red blood: Usually from the lower GI tract — rectum, sigmoid colon. Common causes: haemorrhoids, anal fissures, colorectal polyps or cancer.
• Black, tarry stools (melaena): Blood from the upper GI tract (stomach or duodenum), digested as it passes through. Peptic ulcer, gastric erosion, or tumour.
• Blood in vomit: Upper GI bleeding — urgent. Can range from a Mallory-Weiss tear to a bleeding ulcer.

4. Unexplained Weight Loss

Losing weight without trying — more than 4–5 kg over 3–6 months — is a red flag. When combined with GI symptoms, it may indicate cancer of the stomach, esophagus, or colon, inflammatory bowel disease, malabsorption (celiac disease, chronic pancreatitis), or severe peptic ulcer disease.

An endoscopy combined with blood tests is the standard first investigation for unexplained weight loss with GI symptoms.

5. Iron-Deficiency Anaemia With No Obvious Cause

In men and post-menopausal women, iron-deficiency anaemia almost always indicates blood loss somewhere — and the GI tract is the most common source. Slow chronic bleeding from a gastric ulcer, colon polyp, or cancer may produce no dramatic symptoms but steadily drops haemoglobin.

An upper and lower GI endoscopy (combined OGD + colonoscopy) is standard practice for evaluating unexplained iron-deficiency anaemia.

6. Upper Abdominal Pain Lasting More Than 2 Weeks

Epigastric pain — pain in the upper middle abdomen — lasting more than 2 weeks despite antacids should be investigated. Common causes include:

• Peptic ulcer (duodenal or gastric)
• Gastritis due to H. pylori infection
• Gastric cancer (especially in those over 45)
• GERD with esophageal inflammation

An OGD will directly visualise the stomach and duodenum and allow biopsies for H. pylori testing in a single sitting.

7. Persistent Nausea or Vomiting

Nausea that lasts more than a week without a clear cause — after ruling out pregnancy, medications, and viral illness — needs evaluation. Causes that endoscopy can identify include gastroparesis, gastric outlet obstruction, peptic ulcer, and gastric tumour.

8. Chronic Diarrhoea Lasting More Than 3 Weeks

Diarrhoea that persists for more than 3 weeks, especially if associated with blood or mucus, weight loss, or waking you at night, requires colonoscopy. Key diagnoses to rule out:

• Ulcerative colitis
• Crohn's disease
• Microscopic colitis
• Colorectal cancer
• Infective colitis (for blood + mucus)

9. Family History of Colorectal Cancer or Polyps

Having a first-degree relative (parent, sibling, child) who had colorectal cancer or adenomatous polyps significantly increases your own risk. In these cases, screening colonoscopy should begin at:

• Age 40, or
• 10 years before the age at which the relative was diagnosed — whichever comes first.

Don't wait for symptoms. Most colorectal cancers are curable if found early at the polyp stage.

10. Age 45+ With No Prior Colon Cancer Screening

Current guidelines recommend that average-risk adults begin colorectal cancer screening at age 45. Colonoscopy is the gold-standard screening test — it both detects and prevents cancer by removing polyps before they become malignant.

If you are 45 or older and have never had a colonoscopy, this is your sign.

Endoscopy at Dhaara Hospital, Yelahanka

If you have any of the symptoms above, Dhaara Hospital in Yelahanka offers HD endoscopy — OGD, colonoscopy, ERCP, and EUS — with same-day reports and no long corporate hospital queues. We serve patients from Yelahanka, Hebbal, Vidyaranyapura, Jakkur, Sahakarnagar, Thanisandra, Devanahalli and all of North Bangalore.

• OGD from ₹2,500 | Colonoscopy from ₹4,000
• Same-day reports | Sedation available | Insurance accepted

Frequently Asked Questions

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